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Note 13 - Operating Segments and Geographic Information - Geographic Segment Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Apr. 30, 2016
North America [Member]          
Revenues $ 169,964 $ 494,412 $ 372,353 $ 600,078  
Operating loss (2,883,434) (2,880,664) (5,909,078) (7,096,878)  
Long-lived assets 220,180   220,180   $ 273,049
Total assets 15,717,801   15,717,801   9,553,033
Europe [Member]          
Revenues  
Operating loss (95,702) (78,259) (143,442) (165,982)  
Long-lived assets    
Total assets 266,348   266,348   395,389
Asia and Australia [Member]          
Revenues  
Operating loss (7,517) (40,726) (13,960) (126,522)  
Long-lived assets    
Total assets 387,543   387,543   402,704
Revenues 169,964 494,412 372,353 600,078  
Operating loss (2,986,653) $ (2,999,649) (6,066,480) $ (7,389,382)  
Long-lived assets 220,180   220,180   273,049
Total assets $ 16,371,692   $ 16,371,692   $ 10,351,126